re: Would you sue over $400 or write it off?

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is the first time I had someone deliberately not pay.

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You are lucky if this is the first bad debt you have had selling or providing services to restaurants.

My family had a business that sold to restaurants for 20+ years and we would have a ton of these issues every year.

I would send them a letter telling them you will have to turn it over to collections if you don't get paid in a specified amount of time. Then if they don't answer then turn it over to collections. It's not worth the time in my opinion to bring it to small claims court unless you have a good bit of free time.